MySQL数据库开启或关闭函数功能

应用MySQL时，会遇到不能创建函数的情况。出现如下错误信息：
ERROR 1418 : This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)
那是因为没有将功能开启。

开启MySQL函数功能：SET GLOBAL log_bin_trust_function_creators=1;

关闭MySQL函数功能：SET GLOBAL log_bin_trust_function_creators=0;

查看状态：show variables like '%func%';